Modification of an Unsteady Transonic Small Disturbance Procedure to Allow a Prescribed Steady-State Initial Condition

Abstract

Many attempts have been made to extend the useful range of the two- dimensional unsteady transonic small disturbance procedure, called LTRAN2. This report describes another such extension. LTRAN2 modifications are described that allow the procedure to determine the geometry corresponding to a prescribed pressure distribution. This new geometry would account for all compressible and viscous effects, and would, therefore, be a much better starting point for the unsteady calculations. We present the transonic small disturbance governing equations and boundary conditions. Then the modifications required for the inverse geometry definition are described. Results for three different airfoils (NACA 0012, NACA 64A010, and NLR 7301) are presented and discussed. The NACA 0012 and NLR 7301 results are much improved using this procedure. Keywords: Unsteady transonic flow; Thin airfoils; Unsteady aerodynamics; Small disturbance methods; Transonic aerodynamics; Potential flow; TSD(Transonic Small Disturbances).

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1988
Accession Number
ADA196744

Entities

People

  • Don W. Kinsey

Organizations

  • Wright Laboratory

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Aerodynamics
  • Airfoils
  • Algorithms
  • Boundary Layer
  • Cartesian Coordinates
  • Classification
  • Computational Fluid Dynamics
  • Experimental Data
  • Fluid Dynamics
  • Geometry
  • Mach Number
  • Numbers
  • Potential Flow
  • Pressure Distribution
  • Steady State
  • Two Dimensional
  • Unsteady Aerodynamics

Fields of Study

  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Mechanics and Fluid Dynamics.